SD/MMC card support, USB flash support (with/without FM Radio function) MP3/WMA format decoder Remote control Volume control Work with all audio sources with a 3.5mm jack. li-on Battery inside Power Supply: DC 5 Volt(li-lon Battery inside) USB power cord Output Power: 2w+2w Driver Unit: 52mm speaker , 4ohms Frequency Response: 150-18Khz